package com.bdd.crowd.interceptor;

import com.bdd.crowd.constant.CrowdConstant;
import com.bdd.crowd.entity.Admin;
import com.bdd.crowd.exception.AccessForbiddenException;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author banddong
 * @create 2020-08-29 22:18
 * 登录拦截器
 */
public class LoginInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 1.通过request对象回去Session对象
        HttpSession session = request.getSession();
        // 2.尝试从Session中获取Admin对象
        Admin admin = (Admin) session.getAttribute(CrowdConstant.ATTR_NAME_LOGIN_ADMIN);
        // 3.判断Admin是否为空
        if(admin == null){
            // 4.抛出异常
            throw new AccessForbiddenException(CrowdConstant.MESSAGE_ACCESS_FORBIDEN);

        }
        //如果不为空则true放行
        return true;
    }
}
